{{Parts infobox
|image           = Keys.scad.png
|designers       = [[User:Tim|Timothy Schmidt]]
|date            = 2021
|vitamins         ======
|materials        ======
|transformations  ======
|lifecycles       ======
|tools           = [[Saws]], [[CNC Mills]]
|parts            ======
|techniques       ======
|files            ======
|suppliers        ======
|git              ======
}}

[[Category:Parts]]
[[Category:Motion parts]]


====== Introduction ======
In mechanical engineering, a key is a machine element used to connect a rotating machine element to a [[keyed shafts|shaft]]. The key prevents relative rotation between the two parts and may enable torque transmission. For a key to function, the shaft and rotating machine element must have a keyway and a keyseat, which is a slot and pocket in which the key fits. The whole system is called a keyed joint. A keyed joint may allow relative axial movement between the parts.

Commonly keyed components include gears, pulleys, [[shaft couplers]], and [[washers]]. 

====== Challenges ======

====== Approaches ======

====== References ======
  *  [[https://en.wikipedia.org/wiki/Key_(engineering)|Key (engineering)]]
  *  [[https://www.surpluscenter.com/Power-Transmission/Shafting/Key-Stock/1-4-Square-Key-1-5-Long-G-G-Mfg-411-0424-1-5030-25-A.axd|1/4" square key]]